| 摘要 |
A software protection system incorporates means for inhibiting unauthorised use of the software, comprising a digital magnetic or other recording 15 of the software information, and separate software access-limitation means 16, 18, containing linked information 17 and address indicia 19 which can be sensed by an operator either visually or in a tactile manner, the software including control commands requiring the input of information related to address information generated during operation of at least one software programme, selection of the address information from a set thereof stored on the magnetic recording 15 being effected in a random, pseudo-random or otherwise unpredictable manner and the access limitation means being formed in such a way as to resist duplication by electrostatic photocopying. Alternative forms of the access-limitation means are disclosed (figs. 2-5). <IMAGE>
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